Simple Dashi is a traditional Japanese recipe for a classic basic soup or soup stock made with water infused with kombu (dried kelp). The full recipe is presented here and I hope you enjoy this classic Japanese version of: Simple Dashi.
Combine the water and kombu in a pan. Set aside to sit for 10 minutes then place on a hob, bring to a boil and cook, uncovered, for 30 minutes. Remove the kombu at this point (traditionally it was thrown away, but it's far too delicious to be discarded; I tend to shred finely and then add to the dish later with any vegetables).
Use the stock as the base for any soup, stew or any other dish (like rice dishes) where a flavoured stock would be advantageous.